hi there, i have an issue . i had sex for the second time on july 15th with my boyfriend. Used protection, and he didn't even injeculate in me . i am worried, because in the month of august , i got my period on time , but it's september 10th and i was supposed to get it the 8th . Should i be worried ? i also take Algopyrin for my wisdom teeth, i don't know if that affects anything . I'm just worried. someone help me out